51 lines
3.1 KiB
C#
51 lines
3.1 KiB
C#
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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
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#if !NO_PERF
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using System.Reactive.Concurrency;
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using System.Reactive.Disposables;
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namespace System.Reactive
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{
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/// <summary>
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/// Base class for implementation of query operators, providing performance benefits over the use of <see cref="System.Reactive.Linq.Observable.Create">Observable.Create</see>.
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/// </summary>
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/// <typeparam name="TSource">Type of the resulting sequence's elements.</typeparam>
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abstract class Producer<TSource> : IObservable<TSource>
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{
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/// <summary>
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/// Publicly visible Subscribe method.
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/// </summary>
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/// <param name="observer">Observer to send notifications on. The implementation of a producer must ensure the correct message grammar on the observer.</param>
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/// <returns>IDisposable to cancel the subscription. This causes the underlying sink to be notified of unsubscription, causing it to prevent further messages from being sent to the observer.</returns>
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public IDisposable Subscribe(IObserver<TSource> observer)
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{
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if (observer == null)
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throw new ArgumentNullException("observer");
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var sink = new SingleAssignmentDisposable();
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var subscription = new SingleAssignmentDisposable();
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if (CurrentThreadScheduler.Instance.ScheduleRequired)
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{
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CurrentThreadScheduler.Instance.Schedule(this, (_, me) => subscription.Disposable = me.Run(observer, subscription, s => sink.Disposable = s));
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}
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else
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{
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subscription.Disposable = this.Run(observer, subscription, s => sink.Disposable = s);
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}
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return new CompositeDisposable(2) { sink, subscription };
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}
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/// <summary>
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/// Core implementation of the query operator, called upon a new subscription to the producer object.
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/// </summary>
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/// <param name="observer">Observer to send notifications on. The implementation of a producer must ensure the correct message grammar on the observer.</param>
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/// <param name="cancel">The subscription disposable object returned from the Run call, passed in such that it can be forwarded to the sink, allowing it to dispose the subscription upon sending a final message (or prematurely for other reasons).</param>
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/// <param name="setSink">Callback to communicate the sink object to the subscriber, allowing consumers to tunnel a Dispose call into the sink, which can stop the processing.</param>
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/// <returns>Disposable representing all the resources and/or subscriptions the operator uses to process events.</returns>
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/// <remarks>The <paramref name="observer">observer</paramref> passed in to this method is not protected using auto-detach behavior upon an OnError or OnCompleted call. The implementation must ensure proper resource disposal and enforce the message grammar.</remarks>
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protected abstract IDisposable Run(IObserver<TSource> observer, IDisposable cancel, Action<IDisposable> setSink);
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}
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}
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#endif
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